Florida is likely going to gain 2 seats after the census, although the latest county estimates suggest that 1 is also possible.
This is a first crack at drawing a Republican map for 29 districts:
https://davesredistricting.org/join/67445556-2f17-479d-9de1-d16950ea2dd6https://davesredistricting.org/join/e44ca7ad-b9db-4475-b085-f25089b6a48d(The first map is drawn with 2016 block groups, the second is a tracing of the same to try to get 2016 partisan data. Obviously the population distribution might be somewhat different by 2020, by not quite to a Texan extent, so it should still have some worth - if less so in central Florida.)
My first aim was incumbent protection - every current Republican keeps their hometown and current core of their district, except for those who have already announced they're retiring in 2020. My second aim was to flip FL-07 and to keep at least one Miami-area seat that's winnable for a Cuban Republican. My third aim was to distribute the Democratic packs such that there's an outside chance of one or two of them being competitive in a wave year.
North Florida sees minimal changes. FL-05 takes a bit more of Tallahassee and has to give up some of Jacksonville to compensate, but FL-04 is more than safe enough to take the hit. This FL-05 would have been white plurality by population in 2016, although that's probably no longer true now and the Democratic primary would still be black majority.
FL-07 is the first district to see significant changes. It loses its current portions of Orange County (including Murphy's home in Winter Park) and exchanges them for reliably Republican areas of western Orange County, plus New Smyrna Beach from Volusia County (DeLand would be a cleaner but slightly less Republican alternative.)
Realistically you have got to concede two Democratic sinks in the Orlando area, so both Demmings and Soto get given safe seats. The western exurbs of Orlando are then combined with The Villages to form the new FL-29, which is probably where Webster would choose to run. Trump won by over 20 points there.
FL-11 pushes south into Pasco County and would probably be won by a Republican based in Citrus or Hernando Counties. FL-13 and FL-14 both have to shrink a bit but don't change substantially and FL-12 steps in to grab lost territory, but remains safely Republican. Clinton won the new FL-13 by 3. More aggressive line-drawing could reduce this a bit, but it really depends how much of a hit Bilirakis is willing to take and if Republicans want to risk a court throwing out their lines.
There's not a great amount of change between Tampa/Orlando and the Miami conurbation, except that FL-18 is shored up a bit by adding Okeechobee County. And for the most part Palm Beach and Broward retain fairly similar lines to those they have currently, though FL-20 gets blacker and I made the lines between FL-21 and FL-22 uglier in order to make the lighter slightly less Democratic (but still a bit of a reach even under wave conditions.)
The biggest changes are in and around Miami-Dade. The effective new seat here is actually FL-25, which combines the areas it already has in Collier and Hendry Counties with Monroe County and outlying areas of Miami-Dade. That's a big enough of a Republican base for it to be able to absorb about 200,000 heavily Democratic voters on the western edge of Broward and still remain a 51-46 Trump-Clinton district. I drew it to be give Diaz-Balart a reasonably safe Republican district where he could plausibly win the primary, but as of 2016 whites outnumbered Hispanics 47-40 (and plenty of those Hispanics aren't Cuban) so that may not quite have succeeded.
The alternative refuge for him is the new FL-28, based on Hialeah and areas to the west of Miami proper. This is an area shooting leftward at a rate of knots on the presidentially (McCain won it 64-36, Trump won it 48.7-48.3) but that hasn't entirely followed through downballot so Diaz-Balart might be able to hold it down for a couple more cycles.
My FL-26 and FL-27 aren't shooting left at quite the same rate, but Clinton won both seats by nearly 30 points so I didn't see much point in drawing convoluted lines to make one more competitive than the other.
As of 2022, that probably breaks down as 17 Republicans, 9 Democrats and three swing seats (FL-13, FL-25 and FL-28, with the former leaning Democratic and the latter two Republican.) The current delegation is 14 Republicans to 13 Democrats, so even in the worst case scenario (all the swing seats go Democratic and Murphy holds on) that would still mean a 16-13 delegation, providing a net gain of 2 seats. If instead it broke 20-9, that's a net shift of 10 seats.