Betting and casino games are entertainment, not a way to earn money. Only play with money you can afford to lose, and only if you are 18 or older.
Free, confidential support is available at BeGambleAware (begambleaware.org) and GamCare (gamcare.org.uk). Most operators, including Mostbet, also offer deposit limits, time-outs and self-exclusion in the account settings — use them early, not as a last resort.