motivation comes and goes. I've been dj-ing and producing for a bit over 8 years now. I've had all the ups and downs you could imagine i find setting goals is a good way. Ie pick the next club you want to play at and work towards it. try and be realistic with your goals too but be like "i wanna play ibiza next year" pick something local and work towards it. think stepping stones to you ultimate goal i guess. also don't be afraid to lack motivation either. it does get hard working full time and working on tunes, mixtapes, production, etc. if you find your lacking motivation then have a holiday from dj-ing. give yourself 1-2 weeks to just do nothing, make sure you set aside a re-start date and time that you stick to to get your motor running again after the break. good luck.