This is something I've been thinking about as well and don't have any concrete solutions, but I do have some ideas:
For my comic each season/issue is going to be like a standalone story arc, and it'll be kind of episodic such that a reader could hop into any arc and be fine to pick up and go, but there are recurring characters and such, as well as swapping viewpoints.
On Tapas, I've kind of settled into the idea of editing my "Episode 1" into a table of contents episode (it's just the cover for the first issue atm, so I can just move that to the front of Ep. 2) that will give a short summary and maybe the series icon of each arc, along with which episode it starts on. I particularly like this idea here because you can put clickable links in the creator note so in theory it would be easy to hop to whichever arc you like from that first hub episode. It'll be a while before I get to season 2 to test it out, but I like this idea in theory xD
On webtoons I'm more conflicted and unsure what to do. The same concept as above applies, but my comic never really took off there (partially perhaps because it's in page format, partially perhaps because the art at the start isn't the strongest, or any number of other reasons) so I've been debating whether to try putting the next season as a new series to try and make a stronger first impression or not lol. I'll be trying scroll format with the next one and my art's improved a lot, so it's worth considering I think. The table of contents idea doesn't work as well there either, since creators notes are limited to 400 characters and you can't include clickable links. Soooo I dunno yet, will have to decide later lol.