Hey there @Atanas Petrov,
I think to speak to your hesitations of the saturation of STRs many people get intimidated by the amount of competition that these markets bring. Competition will definitely increase the risk in theory of diving into any market whether it is LA,FL,TN, ETC. Where there are more rentals there are more options for guests to choose where to stay. However competition also speaks to the health of that market as well. Where there is a solidified STR market there is much less likelihood of future legislation prohibition. Also in these areas with healthier STR markets there is much longer history of sustained travel to these locations limiting the chances of decrease travel over time. Finally in the more matured markets the vendors to include agents,lenders,cleaner, handymen, managers, etc are all seasoned and know the ins and outs of the industry. This allows you to have a much smoother transition and acquisition of team members initially to make you successful.
Wish you the best of luck my friend!