I understand where you're coming from, and though it won't fix your problems, keep in mind that the next expansion that comes out will force three older expansions to rotate to Wild, meaning you'll need considerably less to do well. From here on I'd probably save your gold for either future Arena runs when you better know the game (a future update is going to make the draft give you options based on their power levels rather than rarity which should make drafting both easier and sort of more balanced), or packs of the next expansion.
A big part of playing F2P is knowing when you stop buying packs and start saving for the next expansions. Every set tends to have a few cards you really kind of need.
I actually didn't realize, but the new expansion was announced! As people had guessed, it's a spooky forest set.
https://www.hearthpwn.com/news/4439-the-witchwood-is-hearthstones-next-expansionApparently they're already making new hero cards??? Could be super interesting, I just didn't anticipate that happening so soon. The Odds/Evens design is something people thought about for a while but I'm shocked it's actually happening because of the ramifications of taking away tempo and curve from your deck is a terrible downside. Interesting about Genn Greymane finally getting in, but it's odd that he's been added just as Raza rotates, and in Wild, the two cards don't work together to get your Hero Power to (0). I'm more excited about Baku because Justicar Trueheart was one of my favorite cards as a big fan of Control/Fatigue Warrior, but giving up Executes, Slams, the 4-cost weapons, Dirty Rats, Sylvanas, N'Zoth, etc. seems real rough. I'd just play Trueheart instead. Azalina Soulthief just seems like a gimmick card to me. I'm most excited though about Rush and Echo, particularly Echo, because it could potentially fill the void for decks running Baku or Genn, especially if there's an OP 1-cost or OP 2-cost Echo card. Quest Warrior should be pretty interesting this set.
Actually, clarification, Hagatha is apparently going to be the only Hero card in the set, which is SUPER interesting, and I'm kind of interested in their design choice with that. Could this mean that legendary Weapons and Heroes will appear in sets to come independent of other stuff, and that KotFT and K&C were just to get everyone familiar with them? That's a move braver than what I would have expected of Blizzard, so that's actually pretty reassuring.
Also, every class is getting two legendaries, but not necessarily heroes--could mean new weapons, multiple legendary creatures, but it sounds interesting for sure. The pre-purchase deal is also interesting this time around, it's
70 packs for the price of
50, which I think is the best deal they've done so far. Pretty interesting to see this change.