if you dont want to spend wc/scrolls/money or whatever for "beginner" crit rings like glorious blode or glorious ohkeros, then just use normal skill up rings (shuta/blode) the skill uo increase all ur stats and ofc crit and ele dmg, dont forget knight make the lowest ele dmg but itīs much better now then in past. you just need time and a little bit fun while playing knight, i have a 94 knight and normally he is just for buffing but it makes really fun to play with knight so just get some normal skill up accsesories and CF Equip and then you have good and cheap equip to play till 90+.
later on, you can look for some crit rings like glr ohkeros or glr blode and crit necks like glr hwdarium and if you are 100+ try to get glr bellos.
just farm in CF and farm Strenght of Hero in BG.
Good Luck! The Way till 92 is very easy without spending money.
and if ace fix his bot, then let your knight work a bit for you :p
Greetings,
MARCI1111