I played most of your games, also bought most of them. I think You need to focuse more on each concept. Don create the 4th Locker clone. Try to improve the existing one. Right now Lovecraftian locker 1 has still many bugs and 2 has no real end goel. But both are still good games. So Maybe add to them, polish them, maybe sell a DLC that contains new chapter or more interaction options. If you do "in game" purchases you also might find a way around the itch io payment issue. Also it is better to do smalle items/DLCs than big ones. I rather buy 5 2$ extensions than 1 10$ one.
Besides that, get some rest. The fans you got are not leaving if you and your team take a break.
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And in general, I think that all those games and mechanics can be added to part 1 because it will be easier for them there and because of burnout there are risks that they will no longer work on any games because those games are still unfinished, but I hope everything will work out for them, good luck to them and I wish them to get out of the situation