Do you have any radiators that are hot? If so yo need to turn the flow into them down.
Are the radiator valves fully open?
When bleeding you need to close ALL other radiators.

Also to test the flow, turn all off, then one on ... see if it gets hot..... then close it and move onto the next one.... also bleed them while doing this. Once all checked and bled, you can turn them all back on. If they are still only warm they may need flushing due to slime in them causing blockages.