As already stated in #1090261, if it's just about getting your LND node up and running again, you can just use neutrino as the chain backend by starting LND with --bitcoin.node=neutrino --feeurl=https://nodes.lightning.computer/fees/v1/btc-fee-estimates.json.

When it comes to getting your Bitcoin node up and running again, then as I already said in #1088425 since it seems your blockchain got corrupted, (presumably due to a flaky RAM connection) you will have to re-download the chain.