How does one store the evaluation of a big string with multiple env variables $VAR into another env variable?

Becuase I need to make sure I run authentication for my nohup commands I need the real command I want to run to be in a string in here:

nohup sh -c 'echo $SU_PASSWORD | /afs/cs/software/bin/reauth; python -u $RUN_CMD' > $PWD/nohup.out$SLURM_JOBID &

I tried creating the string and storing it in the variable $RUN_CMD e.g.

export RUN_CMD='${!HOME}/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE'

but I can't make it work. How do I do it? My attempts:

(metalearning_gpu) brando9~ $ export RUN_CMD='${!HOME}/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE'
(metalearning_gpu) brando9~ $ echo $RUN_CMD
${!HOME}/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE

(metalearning_gpu) brando9~ $ export RUN_CMD=$(echo '$HOME/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE')
(metalearning_gpu) brando9~ $ echo $RUN_CMD
$HOME/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE

(metalearning_gpu) brando9~ $ export RUN_CMD=$(echo '${!HOME}/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE')
(metalearning_gpu) brando9~ $ echo $RUN_CMD
${!HOME}/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE

(metalearning_gpu) brando9~ $ export RUN_CMD=(eval '$HOME/diversity-for-predictive-success-of-meta-learning/div_src/diversity_src/experiment_mains/main_diversity_with_task2vec.py --manual_loads_name diversity_ala_task2vec_delauny > $OUT_FILE 2> $ERR_FILE')
(metalearning_gpu) brando9~ $ echo $RUN_CMD
eval

related: - https://stackoverflow.com/questions/14049057/bash-expand-variable-in-a-variable - https://unix.stackexchange.com/questions/341243/bash-perform-variable-expansion-of-string#:~:text=Bash%20uses%20the%20value%20of,is%20known%20as%20indirect%20expansion . - https://unix.stackexchange.com/questions/341243/bash-perform-variable-expansion-of-string/341246?noredirect=1#comment1376474_341246