the log in bonuses continue as far as I know.
free gold every two days and free gems other days (thats 10 gems every two days! 1 mistress draw per month -> if u get lucky u get legendary -> power up ur deck immensly. tho across accounts i never got legendary from single draws I did maybe 5 tries so far, 10x supposedly give better chances, thats how I got Athena), with free cards given at every 7 days.
and at 28th day they give epic cards, at least for month of december (void juggler this time, best epic card IMHO sadly I started too late to get her).
so over time u r bound to get stronger.

if u r having hard time advancing in current league, u will have terrible time in higher one.

if u view progress in game as advancing in the league -> the game progress very very slowly
if u view progress in game as improving ur deck while enjoying pleasant view -> sure progression every time u play

my advise is, if u r losing in current league, keep resigning the matches until u go down in league where u can win most of the time so u can get boxes with cards.
do this for a while to strengthen ur deck.

strengthening common and rare cards are important for the dark tower runs where the random pool for 4 card change every turn in sets of common, rare, epic, or legendary.
basically even if someone has legendaries, the dark tower match may end without having chance to play them.

about p2w, the paywall gets very steep, so u will continually have to pay to advance in league.
1USD or 5USD packs r worth it, IMHO, thats like a burgher but...
I've payed over 100USD (thats like two quality ohaholes folks) and got to league 11 before hitting the paywall again. to imagine how much the top ranked dudes paid to get there, they could have bought a nice love doll from japan

don't focus too much on advancing in league if u want to enjoy the game.
didn't it say somewhere that men who look at breasts live longer and happier lives? so use this game for that, enjoy view, live long and prosper
plus guild turf wars are a real fun, the bonuses super helpful too, got this +3 attack to my order heroes for 7 days thing going and now i adapted my deck to play only order heroes.

brawls not good source of income IMHO, but if u lucky u get cards, i got some nagas once (the best common card IMHO), other times, the wins are not worth it, but u can use it to get daily quests done (kill / play cards/ win matches etc.) without worrying about losing league matches.

my verdict: this is perfect game to play right after fapping, play for half an hour before the next round of fapping commences. play little bit every day, b4 u notice, u will be winning every match in ur league, then u r ready for next league.