Actually, that is not such a bad combination if you want to use indicators because they are providing info about somewhat different things. Your S/R can act as target levels or as entries for reversal or for re-entries if they are broken. Equally Fib retracements and extensions are identifying possible target levels or entries but based on mathematical ratios instead of previous market behaviour like with the S/R lines.
The RSI can be used to confirm a trend direction whenever it crosses over the 50 line or to warn of an overbought or oversold condition whenever it goes outside the 75/80 or 20/25 levels. However, these OB and OS levels are best for exiting rather that entries because a strong trend can continue a long way while the RSI stays in the same OB/OS condition.
The main point here is to avoid a collection of indicators that are all designed to identify the same thing because you will not know which one to follow when one says “go for it” and the other say “not yet!”
On one hand, if you find e.g. Fib levels and S/R levels coincide fairly closely then that is probably a strong signal, if only because a lot of other traders will be looking at it too!
But on the other hand, as I mentioned, signals from too many indicators can give contrary signals or leave you unsure which one to act on! This is often called analysis paralysis and is one reason why many traders have given up indicators totally.
A typical problem might arise with S/R levels, For example, if you have 2-3 lines above your long position which line do you go for? If you always close at the first level you will be restricting your profit potential but to leave it for the higher levels risks a reversal at the 1st and even a possible loss.
This is why your risk/management parameters and your trading style and timeframe have to be clear in your mind when choosing where to get out.
Easy ain’t it!