You have a LOT of relevant toons there. Rex is still a top leader for many teams. Yoda got reworked and rocks bigtime now, you could make a great Jedi team for arena, raids etc, just get Hermit Yoda and done. First Order gets you BB8, and along with Finn, Rey etc you get Jedi Rey one of best in game, and Resistance teams are the other competing Meta in top 50 arena other than Sith (and Jedi are now breaking into it!)
So like some others have been saying, really depends on your goal and just how high you want to get in the different areas of the game and how deep your pockets are.
I also quit around the same time as you and came back. I was around 150-200 in Arena back then. Now, after spending 2 months daily FTP (was back then too), I can only get to 300-380. We are WAY behind everyone as Kyno is pointing out, that is definitely the bad news. For Ships, I started with nothing, and now sit at 400, but my ships stink big time, I guess I have to spend more on pilots but have too many other things to spend on that I like more. Being FTP, starting over is not a good option for me, everything takes a LONG time to acquire.
Thing to keep in mind too, is the game has really made a push, to push people to develop MANY different squads, for events, for 3 different raids, for ships, for mod challenges etc. I have a ton of squads now, Empire, NightSisters etc, and do well in raids, which gets you some much needed loot, but I am mostly a jack of all and master of none, my toons/pilots etc need about 2000 - 3000 purple mats, 200 - 300 good mods, 50 - 100 Omegas, and at least 10 - 20 Zetas, only THEN, would I be really competitive in the many different areas in the game including in my guild.
Don't underestimate Raid teams is my advice, you get Raid Han one of best in game (You have 6*already), GK one of best in game, and Traya one of best in game from the 3 raids, and much needed gear (except from the hot mess that is the sith raid, where you get, well, hot garbage....) To do well, you need many squads, starting over would mean this would be a very very long road, versus just filling in some holes in your current roster like NightSisters, Phoenix, G.Spy for new Bug Ship Meta, etc.