Downside
Any attempt to alter your bets independent of changes in house edge will not alter the house edge. Your expected lose rate will be the house edge times your average bet as weighted for how often you make each bet. Raising your bet amount ONLY can raise your loss rate unless it is made at a much lower house edge.
You can find a betting system to make it more likely to win in the short term but they ALWAYS have a higher loss rate over time. If you still are determined in your quest do a search for a system called Oscars Grind. Its bets grow the slowest of any betting system designed for short term win. This generally means the smallest increase in expected loss. You may find the comps you earn tip the balance to profit (not money but value of services earned as weighed against your expected losses) depending on your bet level and your stores comp policy.
The downside is it will still have you losing money faster than flat betting just not anywhere near as much faster as the other alternatives. YOU CANNT ESCAPE THE DOWNSIDE.