About licence... yes, this coud be main problem, but if you really want to be 2d animator and don't want to pay so much money you have:
ToonBoom - best one, cheaper than adobe but not user friendly.
TV Paint - cool pro tool only 250 -500$ (OMG). Have a trial.
Vyond (ex goanimate) - better to dowload flash or smth.
Clip Studio Paint - 50- 150$ can do some animation. You can try trial and decide is it for you.
OatmealPecheneg
But when I tried first time Adobe Animate, I forgot about Flash becouse it is just better... at everything exept painfull video convertation.
ToonBoom is good too, I mean it is better than AF/MF and AA a lot, but I'm lazy bustard and I don't want to forget about AA.
Unity is good, but when I'll have a new laptop, I promise, I shall buy licence for UE4 (or UE5 coz I'll be missed at least for 1 year soon, and who knows what future will bring to us).
Markanime
I can't find a trial version of AA on adobe, the last one I've tried was a trial of CS6, and I dont like it, there's barely new usefull tools, AS3 is not as fast as AS2 to develop and is slower and heavy that older versions from Macromedia.
I still have a perpetual license of F8 ... so Is AA that good for 290€/year ?
As you said Toon Boom is better but I have to learn it first.