About the backtester
Test a crypto strategy on daily prices since 2018 for Bitcoin and the largest coins. Choose the coins, filters and ranking, how many to hold and how often to rebalance, and compare return, drawdown and Sharpe ratio with the benchmark after trading costs.
Only the coins that were large at the time
A strategy on all coins picks among the 10, 20, 50 or 100 largest coins of each week, not among today's largest. Testing today's winners on the past would make almost anything look brilliant.
Test it properly
Check that a result isn't luck with the optimizer and with cross validation from several start dates, add slippage and a stop-loss, and follow a strategy from today with live paper trading.
Time the market on Bitcoin
Go to cash when Bitcoin closes below its moving average, size positions by volatility or rank, and go long, short or both.
Backtests are simulations on historical data, not investment advice. Past results don't guarantee future returns. A few coins that no longer exist have no prices, which makes results look somewhat better than reality.
Crypto data from CoinMarketCap.